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Production-grade SMTP relay server with real-time admin dashboard. Send transactional emails through your own Gmail relay — free alternative to SendGrid, Mailgun, or SES. Multi-account support, Supabase-compatible SMTP, TLS/STARTTLS encryption, per-account API key auth, rate limiting, dead letter queue with retry, live web dashboard with stats & logs. Node.js/Express. Self-hosted email delivery with zero monthly fees.